Brand Sense Partners is suing Britney Spears and dad Jamie Spears for $10 million after they allegedly cheated them out of profits from a fragrance deal.

The marketing company says in the lawsuit filed on Wednesday, they negotiated a deal with Elizabeth Arden in 2004 for BritBrit's fragrance collection, only to have it renegotiated by Jamie last year. By doing so, Brand Sense was cut out of their 35% commission.

The Dark Horse singer joined the glitterati on Karl Lagerfeld's yacht for a boat party in New York on Monday night, wearing head-to-toe Chanel, naturally.

Even though her striped skirt looked like it was made from the same plastic as those reusable bags supermarkets force you to carry nowadays, it was pretty sophisticated when teamed with a collared blouse and black pumps.

We can just hear the crinkle noise it makes when Katy sits down!

The 30-year-old also had on a pair of pearl earrings and a nose ring, which was probably not Chanel, but you never know!